.content{
	width: 630px;
	height: 630px;
	margin: 100px auto;
	position: relative;
}
.btn{
	width: 100%;
	height: 100%;
	position: absolute;
	left: 0;
	top: 0;
	background-color: rgba(0,0,0,.3);
	z-index: 2;
}
.btn button{
	outline: none
	border:none;
	background-color: #004444;
	color: white;
	padding: 5px;
	cursor: pointer;
	width: 80px;
	height: 30px;
	position: absolute;
	top: 50%;
	left: 50%;
	margin-top: -15px;
	margin-left: -40px;
}
.startBtn{
	/* display: none; */
}
.pauseBtn{
	display: none;
}
/* 蛇相应的样式 */
#snakewarp{
	position: absolute;
	width: 600px;
	height: 600px;
	background: #225675;
	border:15px solid #7dd9ff;
}
/* <!-- 头 --> */
.snakeHead{
	height: 15px;
	width: 15px;
	background-color: red;
	border-radius: 10px;
}
/* 	<!-- 身体 --> */
.snakeBody{
	height: 15px;
	width: 15px;
	background-color: #9ddbb1;
	border-radius: 10px;
}
/* <!-- 食物 --> */
.food{
	height: 15px;
	width: 15px;
	background-color: #00FFFF;
	border-radius: 5px;
}